CN107134221A - Display device including ultra-small light emitting diode module - Google Patents

Abstract

The present invention relates to a display device including a subminiature light emitting diode and a method of manufacturing the same. According to an embodiment, a display device including a subminiature light emitting diode module includes: a panel in which first signal lines and second signal lines are arranged in a lattice form; a light emitting diode module including an electrode assembly having a first electrode connected to the first signal line and the second signal line and a ground, and a plurality of subminiature light emitting diode elements connected to the first electrode and the second electrode; and two or more switches for connecting the first signal line and the second signal line to the first electrode, the second electrode being connected to a common electrode formed on the panel, at least one different light emitting diode module being grounded to the common electrode, the two or more switches selectively supplying the first electrode with a current supplied through the first signal line based on a signal of the first signal line and a signal of the second signal line.

Description

Display device including ultra-small light emitting diode module

technical field

The present invention relates to a display device including an ultra-small light-emitting diode (LED) element, and more particularly, to a light-emitting diode display device including a nano-sized ultra-small light-emitting diode element and a manufacturing method thereof.

Background technique

In 1992, Nakamura et al. of Nichia Corporation of Japan succeeded in fusing high-quality single-crystal gallium nitride semiconductors by applying a low-temperature gallium nitride (GaN) compound buffer layer, which made the development of light-emitting diodes active. . A light-emitting diode is a semiconductor having a structure in which a plurality of n-type semiconductor crystals whose carriers are electrons and a plurality of p-type semiconductor crystals whose carriers are holes are joined by the characteristics of semiconductors. A semiconductor element that converts an electrical signal into light having a wavelength range of a desired region. Since this light-emitting diode semiconductor has a high light conversion effect, it consumes very little energy, has a semi-permanent life, and is environmentally friendly, so it is called a revolution in light as a green material. Recently, with the development of compound semiconductor technology, high-brightness red, orange, green, blue and white light-emitting diodes have been developed.

Therefore, the development of light-emitting diode lighting and light-emitting diode display devices using light-emitting diodes is continuing. Among them, light-emitting diode display devices can be used as display devices for various small electronic devices such as mobile phones and notebook computers, and research on them is active. conduct.

Currently, according to an embodiment in which light emitting diodes are used in a display device, the display device is a liquid crystal display (Liquid Crystal Display, LCD) device. Since the liquid crystal display device cannot actively emit light, it is necessary to install a light-emitting backlight on the back of the communication liquid crystal display panel. By shining white light from the rear surface of the liquid crystal display panel, the color of the image presented by the liquid crystal display panel is different from the actual color. near. Initially, cold cathode fluorescent lamps (Cold Cathode Fluorescent Lamp, CCFL) or external electrode fluorescent lamps (External Electrode Fluorescent Lamp, EEFL) were used as light sources. With the emergence of LEDs, backlights using light emitting diodes as light sources have been put into practical use, and attempts to popularize light emitting diodes as full color (full color) light emitting diode display devices that are not simply backlights are continuing.

Following this attempt, the currently popular full-color light-emitting diode display device is an outdoor screen that can be used in everyday life by embedding tens of thousands to hundreds of thousands of red, green, and blue primary color light-emitting diodes on a super-large substrate. Display device, in household televisions or computer monitors called light-emitting diode televisions (LED TVs), the backlight of the liquid crystal display panel is used instead of the conventional fluorescent lamp, so that white or three-color light-emitting diode elements are used as the backlight Liquid crystal display televisions or monitors, these are not true LED display devices.

The reason why conventional light-emitting diode elements cannot be used to develop into television or monitor-level display devices is that there are fundamental limitations in the technical method of using light-emitting diode elements to manufacture display devices and the method of realizing full color.

When conventional light-emitting diode elements are used to directly manufacture a display device for a television, a simple calculation shows that 5 to 40 2- to 8-inch wafers need to be connected to manufacture a 40-inch-class television. Therefore, in the case of using light-emitting diode elements to directly manufacture a TV-level display device by using the currently known manufacturing technology, there are many problems that cannot be overcome by the existing technology. At the same time, in order to achieve full color, it is necessary to embed red, green, and blue primary color light-emitting diode elements together in a pixel (pixel), so it is impossible to achieve full-color light-emitting diodes by simply splicing red, green, and blue light-emitting diode chips. color display device.

In order to realize a high-efficiency light-emitting diode display device, many studies conducted so far have shown that when the III-V group film and nanorod light-emitting diode element are directly grown on the patterned pixel position of the large-area glass substrate for the actual display device In the case of the bottom-up method, the process of directly vapor-depositing the III-V group film on a large substrate having a size of a display device for a TV, and making a high-crystallinity/high-efficiency III-V It is also crystallographically difficult to grow the family film and nanorod light-emitting diode element on the transparent electrode patterned on the transparent amorphous glass substrate. Due to this technical limitation, the method of realizing a full-color display device at the level of a TV or a monitor by directly growing light-emitting diode elements on a large-area glass substrate has hardly been attempted.

Another approach that is being advanced by researchers to realize light-emitting diode display devices is a bottom-up approach based on nanotechnology. This method realizes a large-area display device by growing nanorod-type light-emitting diodes on a single crystal substrate, dividing them and rearranging them bottom-up on electrodes patterned with pixels. However, nanorod light-emitting diodes produced by the above-mentioned bottom-up method have a problem of a sharp drop in luminous efficiency compared to conventional film-type light-emitting diodes grown on wafers.

And as another method, there is a top-down method of realizing a light emitting diode display device by cutting high-efficiency light emitting diode elements. Generally speaking, this method is a method of realizing a display device in a one-to-one correspondence manner by arranging micro-LED elements manufactured in a top-down manner one by one on the sub-pixel positions of a large-area glass substrate. In this case, after growing the LED element on the sapphire substrate, patterning the micro-sized LED element to manufacture the micro-LED element, and then wiring the electrodes, a micro-LED display device smaller than the size of the wafer substrate can be realized.

With the current state of the art, said last method appears to be the preferred method for realizing light-emitting diode display devices. However, in the process of wiring the electrodes of the manufactured light emitting diode element, the electrode, the light emitting diode element, and the other electrode are stacked in a bottom-up manner to make the electrode, the light emitting diode element, and the other electrode In the case of a three-dimensional combination of one electrode, it is necessary to make the light-emitting diode element stand upright in a three-dimensional manner between two different electrodes to be combined with the electrode. As long as it is an ordinary light-emitting diode element, the combination can be performed, but In the case of manufacturing nanometer-sized ultra-small light-emitting diode elements, it is difficult to combine the light-emitting diode elements with electrodes by standing upright in a three-dimensional manner. Since some light-emitting diode elements may exist in a horizontal form, defective pixels may occur, Even if ultra-small light-emitting diodes can be erected three-dimensionally on electrodes, there is a problem that it is difficult to combine ultra-small light-emitting diodes one-to-one with mutually different electrodes. Even if one or two pixels are defective, the display device as a whole will be defective. Therefore, such a defect may lead to a defect in the display device itself.

Prior art literature:

patent documents,

Patent Document 1: Korean Authorized Patent No. 2006-0060461.

Contents of the invention

The present invention proposes in order to solve the above-mentioned problems, by arranging in the pixel unit of the display device including a plurality of ultra-small light-emitting diode elements with a nanometer unit size connected to two different electrodes without a short circuit, thereby realizing A large-area two-color light-emitting diode, a single-color light-emitting diode or a three-primary-color (RGB) full-color light-emitting diode display device.

According to various embodiments, at least a part of the ultra-small light-emitting diode elements disposed in the light-emitting diode module with cross-polarities are operated based on alternating current, thereby providing a display device that minimizes poor image quality.

According to an embodiment of the present invention, a display device including an ultra-small light emitting diode module includes: a panel with a first signal line and a second signal line arranged in a lattice form; a light emitting diode module including an electrode assembly and a plurality of ultra small light emitting diodes element, the electrode assembly has a first electrode connected to the first signal line and the second signal line and a grounded second electrode, and the plurality of ultra-small light emitting diode elements are connected to the first electrode and the second electrode The second electrodes are connected; and two or more switches are used to connect the first signal line and the second signal line to the first electrodes, and the second electrodes are formed on the The common electrodes of the panel are connected, and there is at least one different light-emitting diode module on the ground of the common electrode, and the two or more switches are selectively selected based on the signal of the first signal line and the signal of the second signal line. The ground supplies the current supplied by the first signal line to the first electrode.

According to various embodiments, the plurality of ultra-small light emitting diode elements included in the light emitting diode module may be connected along at least a part of the direction whose polarity is opposite to that of the first electrode and the second electrode.

According to various embodiments, in the light-emitting diode module, a solution containing a plurality of ultra-small light-emitting diode elements is put into the electrode assembly, and the plurality of ultra-small light-emitting diode elements are simultaneously connected to the first electrode and the second electrode by supplying AC power to the electrode assembly. The two electrodes are connected to form a plurality of sub-pixels.

According to various embodiments, in the sub-pixel, the number of the plurality of ultra-small light emitting diode elements contained in an area of 100×100 μm ² may be 2 to 100,000.

According to various embodiments, the plurality of ultra-small LED elements may include at least one of the plurality of ultra-small LED elements for emitting light in blue, green, red, and amber wavelength ranges.

According to various embodiments, the length of the ultra-small light emitting diode element is 100 nm to 10 μm, and the insulating film may be formed by including the active layer in the peripheral surface of the ultra-small light emitting diode element.

According to various embodiments, a plurality of ultra-small LED elements connected to the first electrode and the second electrode are arranged in parallel with the substrate of the LED module.

According to various embodiments, the common electrode may be formed of an Indium Tin Oxide (ITO) film.

According to various embodiments, the display device including the ultra-small light emitting diode module further includes an inverter for supplying the first signal line by converting direct current into alternating current, the display device including the ultra small light emitting diode module An alternating current may be selectively supplied to the first electrode based on a signal of the first signal line and a signal of the second signal line.

According to various embodiments, the first signal line connected to the light emitting diode module may be composed of more than two lines.

The display device comprising ultra-small light-emitting diodes of the present invention and its manufacturing method overcome the difficulty in making ultra-small light-emitting diode elements in the past by connecting nano-unit ultra-small light-emitting diode elements without short-circuiting two ultra-small electrodes that are different from each other. The difficulty of combining with electrodes in a three-dimensional upright manner, and at the same time overcome the difficulty of combining ultra-small light-emitting diode elements with different ultra-small electrodes in a one-to-one correspondence, so that it can be realized by including multiple ultra-small A display device composed of a light-emitting diode module of a small light-emitting diode element.

Moreover, in the conventional light-emitting diode display device, since the sub-pixel position is formed on the electrode, photons generated in the active layer of the ultra-small light-emitting diode element are blocked by the electrode and cannot be extracted. The absorption inside the element makes the ultra-small light-emitting diode element exhibit low light extraction efficiency. It can be changed by changing the position of the sub-pixel, and then through the cylindrical shape of the ultra-small light-emitting diode element connected to the electrode and the electrode and the substrate. Directionality, i.e., the amount of photons released into the atmosphere among the photons occurring in the active layer due to the arrangement of the ultra-small light-emitting diode elements with respect to the substrate increases, as the amount of said photons increases, the ultra-small luminescence can be greatly improved Light extraction efficiency of a diode element.

Furthermore, in order to prevent defective pixels and defects of the overall display device due to defective ultra-small light-emitting diode elements that may occur in case of occurrence, it is possible to include ultra-small light-emitting diode elements by including a plurality of ultra-small light-emitting diode elements in sub-pixels. The defect of the display device is minimized and the original function can be maintained.

Furthermore, since it is different from the conventional light-emitting diode display device in which an ultra-small light-emitting diode element is vertically combined with an upper electrode and a lower electrode three-dimensionally, it is easy to self-assemble an ultra-small light-emitting diode between two different electrodes, so It is possible to mass-produce a light-emitting diode display device in which ultra-small light-emitting diodes are arranged in a drivable state on a large-area plane.

Moreover, by making at least a part of the display device with the cross-polarity arranged on the light emitting diode module operate based on the alternating current, the efficiency of power used in the electronic device can be effectively controlled.

Description of drawings

1 is a diagram showing a display device and a pixel structure in an electronic device according to an embodiment of the present invention;

2 and FIG. 2b are diagrams showing a schematic structure of supplying AC power to a light emitting diode module including a plurality of light emitting diode elements in a display device according to an embodiment of the present invention;

FIG. 3 shows the structure of a light emitting diode module in a display device according to an embodiment of the present invention;

FIG. 4 is a process of manufacturing a light emitting diode module according to an embodiment of the present invention;

FIG. 5 shows a structure in which a light emitting diode module is arranged in a pixel in a display device according to an embodiment of the present invention;

Explanation of reference signs

100: electronic device 150: display device

101, 103, 111, 113: pixels 231, 233: signal lines

201: LED module 300, 600: LED module

320: transparent conductive film 301, 303: electrodes.

detailed description

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art to which the present invention pertains can easily implement the present invention. The invention may be embodied in many different forms, specific embodiments may be illustrated in the drawings, and related detailed descriptions may be written. However, this is not intended to limit the embodiment of the present invention, but it should be understood that the present invention includes all changes and/or equivalent technical solutions and even replacement technical solutions within the scope of the idea and technology of the present invention. In order to clarify the present invention, parts irrelevant to the description may be omitted from the drawings, and the same reference numerals may be used for similar structural elements throughout the specification.

In various embodiments of the present invention, expressions such as "or" and "at least one" may represent one of the words listed together, or a combination of two or more. For example, "A or B", "at least one of A and B" may only include one of A or B, or both A and B may be included.

In various embodiments of the present invention, expressions such as "first", "second", "first", and "second" can modify various structural elements, but are not limited to expressing the order or importance of corresponding structural elements, etc. . For example, the first device and the second device are both devices, and may represent devices that are different from each other. Moreover, without departing from the scope of rights of the various embodiments of the present invention, if the structure, function, work and other elements of the first device are the same or similar to those of the second device, the first device may be named as the second device. device, and similarly, the second device may also be named the first device.

In various embodiments of the present invention, when it is mentioned that one structural element is "connected" or "coupled" to another structural element, it should be understood that multiple structural elements may be directly connected or coupled , but there may also be at least one other structural element between several structural elements. On the contrary, when it is mentioned that one structural element is "directly connected" or "directly coupled" to another structural element, it can be understood that there is no other structural element among the plurality of structural elements.

The terms used in the various embodiments of the present invention are used to describe a specific embodiment and should not be construed as limiting the present invention. For example, expressions in the singular may include the plural unless the context clearly indicates a different meaning. expression.

It is obvious that the devices (or electronic devices) in the various embodiments of the present invention can be replaced by devices in other forms that are the same or similar, unless there are expressly stated limited matters. Moreover, the electronic devices in various embodiments of the present invention may be composed of one or a combination of more than one of the various electronic devices mentioned. For example, a device may be constituted by a structure including at least a part of the described plurality of devices or at least a part of the functions of the devices. According to an embodiment, the device may be constituted by at least one display device (display section), or may be constituted by a device including at least one display device.

Hereinafter, electronic devices of various embodiments will be observed with reference to the accompanying drawings. When the term "user" is recorded in various embodiments, it may refer to a person using an electronic device or a device using an electronic device (such as an artificial intelligence electronic device). Moreover, the electronic device may be attached or worn on a part of the user's body, and in this state, the user may be referred to as a "user" or a "wearer". In a case where the electronic device is a device attached or worn on a part of a user's body, the electronic device may be referred to as a wearable electronic device (wearable device). Also, an electronic device designated by a user (for example, a smart phone, a personal digital assistant (PDA), a smart watch, etc.) may be referred to as a user device.

FIG. 1 is a diagram showing a display device and a pixel structure in an electronic device according to an embodiment of the present invention.

According to an embodiment, the electronic device 100 may include at least one display device (or display portion) 150 . Here, the display device 150 may refer to a display device, for example, a display device using an LED panel including LED elements as a backlight and/or a display device using the LED panel as a display portion.

Referring to FIG. 1 , the minimum unit of an image displayed on the display device 150 of the electronic device 100 can be defined by a pixel (or pixel). According to an embodiment, a pixel can be defined as a matrix form (or structure) based on a grid-like space formed in rows and columns in the display device 150, but is not limited thereto, and a pixel can be defined based on one LED element matrix form. Also, a pixel may be defined in a matrix form based on a plurality of LED elements constituting a predetermined pattern and/or an LED module in which the plurality of LED elements are arranged.

According to an embodiment, the display device 150 is distinguished by at least one line in a row and a column, in this case, a plurality of lines formed in a row or column may be constituted by electrode lines (such as word lines), or It may be constituted by a data line (such as a bit line) for inputting/outputting a signal. In the following description, a line arranged in a row or column constituting the display device 150 may be referred to as a first signal line, and a line arranged in another row or column may be referred to as a second signal line.

According to various embodiments of the present invention, although a plurality of lines arranged in rows and columns of the display device 150 are represented by first signal lines and second signal lines, the present invention is not limited thereto, and the above data can be Lines, etc., at least one of the first signal line and the second signal line may not be arranged in the row and column of the display device 150, but formed separately, obviously, at least one signal line may be omitted.

According to an embodiment, the rows (for example, the first signal lines 231 ) constituting the display device 150 may be composed of electrodes. For example, referring to FIG. 2 and FIG. 2 b , WL1 , WL2 , WL3 to WLn may be constituted by wires for supplying a specified basic signal (eg, frequency) or current to the LED module.

According to an embodiment, the columns (for example, the second signal lines 233 ) constituting the display device 150 may be composed of data lines. For example, referring to FIG. 2 and FIG. 2b, BL1, BL2, BL3 to BLm can control signals input/output to the LED module.

2 and FIG. 2b, the first signal line 231 is represented by the name WL, and the first signal line 231 is described as a line for supplying a designated basic signal (for example, frequency) or current to the LED module. , the second signal line 233 is represented by the name BL, and the second signal line 233 is described as a line for controlling input/output signals to the light-emitting diode module, but these are used for illustration and are configured in a display device An embodiment of the signal line of 150, the plurality of signal lines are not limited thereto, each signal line can be used in various ways, obviously, other names can also be used.

According to an embodiment, the pixel of the display device 150 can be configured to include one light emitting diode element based on a grid formed by one row and one column, but in the following description, it is possible to include two or more light emitting diode elements in one pixel The display device 150 of a diode element will be described.

According to various embodiments, the ground of the LED element included in the display device 150 is made of a conductive transparent conductive film (for example, an indium tin oxide film (Indium Tin Oxide film, ITO film)), so that the display device 150 can be grounded. A common electrode is formed on a two-dimensional plane.

2 and 2b are diagrams showing a schematic structure of supplying AC power to a light emitting diode module including a plurality of light emitting diode elements in a display device according to an embodiment of the present invention.

According to an embodiment, the display device 150 shown in FIG. 2 and FIG. 2 b may be a display device 150 in which pixels are formed based on the first signal lines 231 and the second signal lines 233 . The display device 150 may be connected to a light emitting diode module 201 including a plurality of light emitting diode elements in one pixel. For example, the LED element 211 may be ultra-small (eg, nano-sized). According to an embodiment, the diameter of the LED element 211 may be 300 nm to 700 nm, and the length may be 2 μm to 3 μm. Therefore, the light emitting diode element can be described as an ultra-small light emitting diode element.

In a plurality of light-emitting diode elements, it is possible to use light in the blue wavelength range to emit at least a part of the light in the green, red, and amber wavelengths. Front part) includes the color transform layer. In this case, the plurality of LED elements (or the LED module 201) may include at least one of the plurality of LED color conversion elements formed with a color conversion layer for emitting blue, green, At least some of the red and amber wavelengths of light.

According to an embodiment, the color conversion layer may include at least one phosphor (or phosphor) for passing light of a specified frequency range. For example, when the light-emitting diode is an ultraviolet (UV) light-emitting diode, preferably, the phosphor excited by ultraviolet light is a phosphor containing one of blue, yellow, green, amber and red. At this time, Can be formed by monochromatic LED lights for emitting a selected one color.

And, preferably, the phosphor excited by ultraviolet rays can exhibit at least one color among blue, yellow, green, amber and red, more preferably, exhibit blue/yellow, blue/green/ A mixed phosphor of red and blue/green/amber/red, in which case white light can be emitted by means of the resulting phosphor.

According to various embodiments, the specific types of phosphors that can be combined can be changed according to the colors emitted by the light-emitting diode elements, and the phosphors to be combined can be known combinations. The present invention is not particularly limited to this, and can have various embodiments. .

For example, when the light emitting diode element is an ultra-small blue light emitting diode, preferably, the phosphor excited by blue may be one or more phosphors selected from yellow, green, amber and red. More preferably, it may be a mixed phosphor of blue/yellow, blue/green/red, and blue/green/amber/red, and in this case, white light can be irradiated with the phosphor.

Preferably, the yellow phosphor can be selected from Y ₃ Al ₅ O ₁₂ :Eu, Lu ₃ Al ₅ O ₁₂ :Eu, (Sr, Ba) ₃ SiO ₅ :Eu, (Sr, Ba, Ca) ₂ SiO ₄ : Eu, Ca-α-SiAlON: one or more phosphors in the group consisting of Eu and (Ba, Eu)ZrSi ₃ O ₉ .

Preferably, the blue phosphor can be selected from ZnS:AgCl, ZnS:AgAl, (Sr, Ba, Ca, Mg) ₁₀ (PO ₄ ) ₆ C _l2 :Eu, (Ba, Sr)MgAl ₁₀ O ₁₇ :Eu , BaMgAl ₁₀ O ₁₇ :Eu, (Sr,Ba) ₃ MgSi ₂ O ₈ :Eu, LaSi ₃ N ₅ :Ce, LaSi ₅ Al ₂ ON ₉ :Eu, Sr ₂ MgSi ₂ O ₇ :Eu, CaMgSi ₂ O ₆ : One or more phosphors in the group consisting of Eu.

Preferably, the green phosphor can be selected from SrGa ₂ S ₄ :Eu, (Sr, Ca) ₃ SiO ₅ :Eu, (Sr, Ba, Ca)SiO ₄ :Eu, Li ₂ SrSiO ₄ :Eu, Sr ₃ SiO ₄ :Ce, Li, β-SiALON:Eu, CaSc ₂ O ₄ :Ce, Ca ₃ Sc ₂ Si ₃ O ₁₂ :Ce, Caα-SiALON:Yb, Caα-SiALON:Eu, Liα-SiALON:Eu, Ta ₃ Al ₅ O ₁₂ :Ce, Sr2Si5N8:Ce, (Ca, Sr, Ba)Si ₂ O ₂ N ₂ :Eu, Ba ₃ Si ₆ O ₁₂ N ₂ :Eu, γ-AlON:Mn and γ-AlON:Mn, One or more phosphors in the group consisting of Mg.

Preferably, the amber phosphor can be selected from the group consisting of (Sr, Ba, Ca) ₂ SiO ₄ :Eu, (Sr, Ba, Ca) 3SiO5:Eu and (Ca, Sr, Ba) ₂ Si ₅ N ₈ :Eu More than one phosphor in the group.

Preferably, the red phosphor can be selected from (Sr, Ca)AlSiN ₃ :Eu, CaAlSiN ₃ :Eu, (Sr, Ca)S:Eu, CaSiN ₂ :Ce, SrSiN ₂ :Eu, Ba ₂ Si ₅ N ₈ :Eu, CaS:Eu, CaS:Eu, Ce, SrS:Eu, SrS:Eu, Ce and Sr ₂ Si ₅ N ₈ :Eu One or more phosphors in the group.

According to various embodiments, the plurality of LED elements are not limited to light in the blue wavelength range, but may form a color conversion layer that emits blue, green, red, or amber light based on light in the ultraviolet and near-ultraviolet wavelength ranges. In this case, the plurality of LED elements (or the LED module 201) may include at least one of the plurality of LED color conversion elements formed with phosphors for emitting blue, green, red, At least some of the amber wavelength light.

Wherein, the phosphors used to form the color conversion layer are not limited to the specific types of phosphors of different colors. And, in the case of not including the phosphor, the interior of the color changing layer may be filled with one or more of transparent silicon binders, organic polymers, inorganic polymers, and emitting substances, but is not limited to all of them. record.

Moreover, according to various embodiments, the color changing layer is not limited to containing phosphors or containing any one or more of transparent silicon binders, organic polymers, inorganic polymers, and emitting substances, and may contain polarized light. Body (or polarizing material) and other optical structural elements.

According to an embodiment, when a pixel (eg, 101 , 103 , 111 or 113 ) in the display device 150 includes the LED module 201 , each LED element 211 constituting the LED module 300 may be defined. Referring to FIG. 2 and FIG. 2 b , it is shown that the LED module 201 includes three LED elements 211 , but it is not limited thereto. Obviously, the LED module 201 can be composed of a plurality of LED elements 211 .

According to various embodiments, it can be confirmed that the arrangement of a plurality of ultra-small light emitting diode elements included in one pixel is not configured in a predetermined direction. For example, referring to the LED module 201 , one ultra-small LED element is grounded in the opposite direction (eg, opposite in polarity) to the other two ultra-small LEDs and connected to electrodes (eg, first signal lines). At this time, when AC current is supplied from the display device 150 to the LED module 201 , all ultra-small LED elements included in the LED module 201 can operate based on the frequency of the AC current and the signal frequency.

FIG. 2 is a diagram showing a schematic configuration of using an inverter to supply AC power to the display device in a display device according to an embodiment of the present invention.

According to an embodiment, that is, according to an embodiment in which the light-emitting diode module 201 operates by supplying an alternating current to the display device 150, the inverter 241 for converting direct current (DC) to alternating current (AC) may be configured with The signal controller 243 is connected to at least one electrode of the display device 150 (for example, the first signal line 231, WL), and generates a signal for driving the light-emitting diode module 201 in conjunction with the alternating current provided through the first signal line. It may be connected to at least one data line (for example, the second signal line 233 , BL) configured on the display device 150 .

According to an embodiment, more than two switches (eg, 220 , 222 ) may be connected between the first signal line 231 and the LED module 201 . At this time, the source and drain of the first switch 220 and the second switch 222 connected to the first signal line 231 and the LED module 201 can be connected in opposite directions.

According to an embodiment, the signal controller 243 can generate a selection signal (for example, a binary signal, a dial pulse, a multi-frequency signal) based on a signal received from a processor (not shown) of the electronic device 100, and send to each data line transmission.

The current converted into AC by the inverter 241 can be provided to the LED module 201 of the display device 150 through the first signal line. At this time, the first switch 220 and the second switch 222 may selectively provide the AC current to the LED module based on the frequency of the current received from the inverter and the selection signal received from the signal controller 243 .

FIG. 2b is a diagram showing a schematic configuration of using a distributor to supply AC power to the display device in the display device according to an embodiment of the present invention.

According to an embodiment, that is, according to an embodiment in which the light-emitting diode module 201 operates by supplying an alternating current to the display device 150, the current distributor 261 for distributing the current can be connected to at least one electrode ( For example, the first signal line 235 (WL) is connected, and the signal controller 243 that generates a signal for driving the light-emitting diode module 201 in conjunction with the alternating current provided through the first signal line can be configured with at least one of the display device 150. One data line (for example, the second signal line 233 ) BL is connected.

Wherein, the current distributor 261 may include at least one inverter (for example, the inverter 241 in FIG. 2 ) for converting direct current into alternating current.

According to an embodiment, in the display device 150, the first signal line 231 may include more than two lines, for example, may include a line for supplying a negative (-) current to the LED module 201 (at this time, the voltage is a positive voltage) The cathode signal line 271 and the anode signal line 273 for supplying positive (+) current to the light emitting diode module 201 (in this case, the voltage is a negative voltage).

According to an embodiment, during the process of supplying power to the display device 150 , the current distributor 261 can separate the AC current converted from DC to AC by the inverter 241 based on the phase, and can selectively supply the anode signal line 273 Or the cathode signal line 271 supplies a phase-specified current.

According to various embodiments, in the process of supplying power to the display device 150, the current distributor 261 is not limited to supplying positive current to the anode signal line 273 and supplying negative current to the cathode signal line 271. The timing (or pattern) of supplying the direct current is assigned to supply the direct current to the anode signal line 273 and/or the cathode signal line 271 .

According to one embodiment, the source and drain of the switch 251 for connecting the cathode signal line 271 and the light emitting diode module 201 and the switch 253 for connecting the anode signal line 273 and the light emitting diode module 201 are connected in opposite directions, so that The alternating current delivered from the current distributor 261 is selectively supplied to the light emitting diode module 201 .

According to an embodiment, the signal controller 24 generates selection signals (eg, binary signals, dial pulses, multi-frequency signals, etc.) The selection signal is transmitted.

According to an embodiment, among a plurality of pixels (eg, 101 , 103 , 111 or 113 ) formed in the display device 150 , referring to the first pixel 101 , each pixel may include at least one switch 220 . However, it is not limited thereto, and in the display device 150, two or more specified number of pixels may include one switch.

FIG. 3 shows the structure of a light emitting diode module in a display device according to an embodiment of the present invention.

Referring to FIG. 3 , the light emitting diode module 300 may include a plurality of light emitting diode elements 313 , 315 . Among the plurality of electrodes (for example, the first electrode 301 and the second electrode 303 ) formed on the LED module, at least one electrode may be connected to a power source for supplying power and/or transmitting signals to the LED elements 313, 315 . For example, in the case that the first electrode 301 is connected to the first signal line 231 and/or the second signal line 233 through at least one switch, the second electrode 303 can be used as a common electrode to form a transparent conductive film on the display device 150 (for example, indium tin oxide film) 320 are connected.

Similarly, when the first electrode 301 is connected to the transparent conductive film (for example, indium tin oxide film) 320 formed on the display device 150 as a common electrode, the second electrode 303 can be connected to the first signal line through at least one switch. 231 and/or the second signal line 233 are connected.

Herein, the material of the common electrode formed on the display device 150 is described as an indium tin oxide film, but it is not limited thereto, and various materials such as a graphene film and a metal nanowire film may be used.

According to the description, the first signal line 231 and the second signal line 233 formed on the display device 150 can be connected to the light emitting diode module 300 including the first electrode 301, the second electrode 303 and at least one ultra-small light emitting diode element 313, 315. connect.

According to an embodiment, in the light emitting diode module 300, a "sub pixel (Sub Pixel)" may include a first electrode 301, a second electrode 303, and a plurality of ultra-small light emitting diode elements connected to the at least one electrode at least one. Among them, the position of at least one sub-pixel 311 can be formed according to the first electrode 301 and the second electrode 303, but does not include the upper and lower spaces of the first electrode 301 and the second electrode 303, which can mean that a plurality of ultra-small light-emitting diodes can be actually arranged Space.

That is, one pixel (eg, a unit pixel) may include a plurality of sub-pixels 311 , and each sub-pixel may include one ultra-small LED element 313 or 315 and/or include two or more ultra-small LED elements 313 and 315 .

According to an embodiment, the sub-pixel 311 is formed in the space divided by the first electrode 301 and the second electrode 303 in the light-emitting diode module 300, and the sub-pixel 311 can be directly formed on the substrate surface of the light-emitting diode module 300 or separated. indirectly formed on the upper portion of the substrate. In addition, at least one of the first electrode 301 or the second electrode 303 may be located on the same plane or on a different plane.

According to an embodiment, the sub-pixels may have the same or different areas. Preferably, the unit area of the sub-pixel 311 suitable for a display device, that is, the area of the arrangement area configured with two electrodes that are independently driven by arranging ultra-small light-emitting diode elements 313 and 315 is 50 μm ² to 100,000 μm ² , more preferably, may be 100 μm ² to 50000 μm ² , but the unit area of the sub-pixel is not limited to the above-mentioned area. Preferably, the sub-pixel 311 may have an area of 50 μm ² to 100000 μm ² .

When the area of the sub-pixel 311 is less than 50 μm ² , it may be difficult to prepare a unit electrode, and there may be problems in manufacturing ultra-small LEDs due to the need to reduce the length of the ultra-small LEDs. In the case of more than 100000 μm ² , the manufacturing cost may increase due to the increase in the number of ultra-small LED elements included, and there may be a problem of uneven distribution in the arrayed ultra-small light-emitting diodes. The number of pixels with a limited area is reduced, so there is a problem that a high-resolution display device cannot be realized. According to an embodiment, that is, according to a preferred embodiment of the present invention, the total number of the sub-pixels 311 included in the LED module 300 of the display device 150 may be 2 to 10000. But not limited to the above description, the size of the embodied LED module 300 may vary according to the area and/or resolution of the display device.

According to an embodiment, the number of ultra-small LED elements included in each 100×100 μm ² area of the LED module 300 may be 2 to 100,000. More preferably, it may be 10 to 10000. In the case where the included number is less than 2, the ratio (%) of the light characteristic change cannot be minimized due to failure of some of the ultra-small LED elements among the 2 ultra-small LED elements, and it may be difficult to make the light-emitting diode The module 300 normally emits light through the ultra-small LED elements 313 and 315 , and there may be a problem that the display device 150 may fail due to continuation. In the case where the included number exceeds 100,000, the manufacturing cost may increase, and there may be a problem in arranging ultra-small light emitting diode elements.

According to various embodiments of the present invention, a plurality of ultra-small light-emitting diode elements are included in the light-emitting diode module 300. In a conventional light-emitting diode display device, since one light-emitting diode is attached to a unit pixel position, the attached light-emitting diode When the element is defective, the efficiency of the entire light-emitting diode display device decreases, and the display device itself may be defective. For this reason, in a preferred embodiment of the present invention, an attempt is made to solve the problem by making a unit pixel include a plurality of ultra-small light emitting diodes. According to an embodiment, in the case of using one ultra-small light emitting diode, one defect can cause 100% variation in light characteristics, but the number of ultra-small light emitting diodes included in a unit pixel can be reduced due to one defect. The ratio of the change in the optical characteristics caused by it. Therefore, the defect rate of the display device 150 can be reduced by including a plurality of ultra-small LED elements in the LED module 300 . Thus, even if some of the ultra-small light-emitting diode elements included in the unit pixel are defective, the other plurality of ultra-small light-emitting diode elements are normal. Each sub-pixel 311 normally emits light by means of the ultra-small LED elements 313 and 315 , so that the defective rate of the LED display device as a whole can be minimized and the luminous efficiency can be maximized.

Moreover, according to an embodiment of the present invention, in the process of arranging the ultra-small light-emitting diode elements connected to the first electrode 301 and the second electrode 303 of the light-emitting diode module 300, the polarity can be made uneven. manufacture.

3, in the process of connecting with the first electrode 301 and the second electrode 303, the first ultra-small light emitting diode element 313 and the second ultra-small light emitting diode element 315 of the light emitting diode module 300 can be in opposite directions (for example, opposite polarity) arrangement.

According to one embodiment, in the first ultra-small LED element 313, the first pole is connected to the first electrode 301 (at this time, the second pole of the first ultra-small LED element 313 is connected to the second electrode 303) , so that it can emit light under the condition of receiving a positive current, the first pole of the second ultra-small light emitting diode element 315 is connected to the second electrode 303 (at this time, the second pole of the second ultra-small light emitting diode element 315 is connected to the first electrode 303 electrode 301) so that it can emit light when it receives a negative current.

Generally speaking, a display device can output a graphic interface by using a direct current. At this time, when at least a part of the light-emitting diode elements constituting the display device are not working, the corresponding position of the display device may display dead pixels or generate spots, thereby increasing the ratio of light characteristic changes.

According to various embodiments of the present invention, as described above, when the plurality of ultra-small light-emitting diode elements 313, 315 included in the light-emitting diode module 300 are directed in opposite directions (for example, the polarities of at least a part of the ultra-small light-emitting diode elements cross each other) ) arrangement, and use the AC current to control by using the light emitting diode module 300 to output the graphic interface, even if a part of the ultra-small light emitting diode elements constituting the display device 150 are not working, it is possible to use other polarity and electrode phase Connected ultra-small light-emitting diode elements to work.

Therefore, based on the AC current supplied to the light emitting diode module 300 at a specified time point, adjacent multiple ultra-small light emitting diode elements connected in opposite directions operate alternately (or crosswise), thereby preventing Dead pixels and/or speckle occur, so the rate at which the light characteristics change can be minimized.

FIG. 4 shows a process of manufacturing an LED module according to an embodiment of the present invention.

According to the first embodiment of manufacturing the light emitting diode module of the present invention (for example, the light emitting diode module 300 of FIG. 3 ), the ultra-small light emitting diode module 300 can be manufactured by including the following steps: The first electrode on the bottom substrate and the second electrode formed in a manner spaced apart from the first electrode are thrown into a solution containing a plurality of ultra-small light-emitting diode elements with an electrode line for an ultra-small light-emitting diode; step 2, in order to make The first electrode and the second electrode are simultaneously connected to a plurality of ultra-small light-emitting diode elements to supply power to the electrode lines; and step 3, making the plurality of ultra-small light-emitting diode elements arrange themselves.

First, a method of manufacturing an electrode wire for an ultra-small light emitting diode will be described. Specifically, FIG. 2 and FIG. 2b may be perspective views showing the manufacturing process of the electrode lines formed on the bottom substrate according to a preferred embodiment of the present invention. However, the manufacturing process of the electrode wire for ultra-small light emitting diodes is not limited to the manufacturing process mentioned later.

According to an embodiment, part (a) of FIG. 4 shows a bottom substrate 400 formed with electrode lines. Preferably, as the bottom substrate 400, glass substrates, crystal substrates, sapphire substrates, plastic substrates, and bendable (or flexible) substrates can be used. (flexible)) is one of the flexible polymer films. More preferably, the substrate may be transparent. However, it is not limited to the above types, and any type can be used as long as it is a base substrate on which ordinary electrodes (or common electrodes) can be formed.

The area of the bottom substrate 400 is not limited, and can be obtained by considering the area of the first electrode to be formed on the bottom substrate 400, the area of the second electrode, and the ultra-small light emitting diodes connected to the first electrode and the second electrode. The area of the bottom substrate 400 is changed according to the size of the diode element and the number of connected ultra-small LED elements. Preferably, the bottom substrate may have a thickness of 100 μm to 1 mm, but not limited thereto.

According to an embodiment, as shown in part (b) of FIG. 4 , a photoresist (PR, Photo Resist) 401 may be coated on the base substrate 400 . The photoresist may be a photoresist generally used in the field to which the present invention pertains. Wherein, according to an embodiment of the method of applying the photoresist to the bottom substrate 400, one of spin coating, spray coating and screen printing can be used, preferably, the spin coating method can be used, but not As a specific method, those known in the technical field to which the present invention pertains can be used. The photoresist 401 coated on the base substrate 400 may have a thickness of 0.1 μm to 10 μm. However, the thickness of the applied photoresist 401 may be changed in consideration of the thickness of the electrode to be vapor-deposited on the base substrate later.

As described above, after forming the photoresist 401 layer on the base substrate 400, as shown in part (c) of FIG. A mask 402 with corresponding patterns 402a and 402b drawn on electrode lines separated from each other is placed behind the photoresist 401 layer, and the upper part of the mask 402 can be exposed to ultraviolet rays.

A general step of removal by immersion in a photoresist solvent may be performed on the photoresist that has not been exposed in the base substrate 400, whereby the electrode to be formed as shown in part (d) of FIG. 4 can be removed. The exposed photoresist layer portion of the line. According to an embodiment, the width of the corresponding pattern (for example, 402a) of the first electrode line corresponding to the electrode line for the ultra-small light emitting diode may be 100nm to 50μm, and the width of the corresponding pattern (for example, 402b) of the second electrode line ) may have a width of 100 nm to 50 μm, but is not limited to the above description.

According to an embodiment, as shown in part (e) of FIG. 4 , an electrode-forming substance 403 in the shape of an electrode line mask 402 may be evaporated on the portion where the photoresist is removed. In the case where the electrode-forming substance is the first electrode, it may be one or more metal substances selected from the group consisting of aluminum, titanium, indium, gold, and silver, or one or more metal substances selected from the group consisting of indium tin oxide, ZnO:Al, and carbon More than one transparent substance in the group consisting of nanotube (CNT)-conducting polymer (polmer) complexes. Wherein, in the case where there are two or more materials for forming the electrode, preferably, the first electrode can be a structure formed by laminating two or more materials, and more preferably, the first electrode can be made of two materials of titanium/gold. layered structure. However, the first electrode is not limited to the above description.

In the case where the electrode-forming substance is the second electrode, it may be one or more metal substances selected from the group consisting of aluminum, titanium, indium, gold and silver, or one or more metal substances selected from the group consisting of indium tin oxide, ZnO:Al and More than one transparent substance in the group consisting of carbon nanotube-conducting polymer complexes. In the case where the electrode-forming substance is composed of two or more substances, preferably, the second electrode can be a structure formed by laminating two or more substances, and more preferably, the second electrode can be formed by laminating two substances of titanium/gold. formed structure. However, the second electrode is not limited to the above description.

The substances forming the first electrode and the second electrode may be the same or different. The electrode-forming substance can be vapor-deposited by one of thermal evaporation, electron beam (E Beam) evaporation, sputtering evaporation, and screen printing methods. Preferably, thermal evaporation can be used. Plating method, but not limited thereto.

After the electrode-forming substance 403 is vapor-deposited, as shown in part (f) of Figure 4, if acetone, N-methylpyrrolidone (1-Methyl-2-pyrrolidone, NMP) A photoresist remover in sulfoxide, DMSO) removes the photoresist 401 layer coated on the bottom substrate 400, and then the electrode lines 406, 407 evaporated on the bottom substrate 400 can be manufactured. Wherein, the electrode lines 406 and 407 vapor-deposited on the bottom substrate 400 can be formed in a designated pattern through the first electrode 410 and the second electrode 430 . Also, the first electrode 410 and/or the second electrode 430 shown in FIG. 4 may be composed of the same or similar electrodes as the first electrode 301 and the second electrode 303 shown in FIG. 3 .

In the electrode wires 406, 407 of the present invention manufactured by the above method, preferably, the unit electrode area, that is, the area of the arrangement region where two electrodes that can be independently driven by arranging ultra-small light-emitting diode elements are arranged is 1 μm ² to 100 cm ² , more preferably, may be 10 μm ² to 100 mm ² , but the area of the unit electrode is not limited to the area. And, the electrode line may include one or more unit electrodes.

Furthermore, in the electrode lines, the distance between the first electrode 410 and the second electrode 430 may be smaller than the length of the ultra-small LED element 413 . Thus, the ultra-small light emitting diode element 413 can be sandwiched between the first electrode 410 and the second electrode 430 or connected to the two electrodes in a lying state.

On the other hand, as long as it is formed separately from the first electrode 410 and can be mounted with an ultra-small LED element 413, it can be used as the electrode line of the present invention. The first electrode 410 and the second electrode separated on the same plane The specific configuration of electrodes 430 may vary depending on their purpose.

According to an embodiment, part (g) of FIG. 4 shows a first electrode 410 formed on a bottom substrate 400, a second electrode 430 formed on the same plane and separated from the first electrode, and a plurality of superconductors. A solution of the small LED element 413 (referred to as the solvent 440 here). The solution including the ultra-small light emitting diode device 413 can be applied to the electrode area of the bottom substrate 400 where the first electrode 410 and the second electrode 430 are formed.

Afterwards, according to an embodiment of step 2, the ultra-small LED elements 313 and 315 included in the LED module 300 can be arranged in a non-uniform manner. Among them, in order to minimize the ratio (%) of the light characteristic change of the display device 150, it is also necessary to use The connection is made so that the number of ultra-small light emitting diode elements having opposite polarities is uniform (for example, close to 1:1) within a predetermined range.

According to an embodiment, as shown in part (h) of FIG. 4 , in order to make a plurality of ultra-small LED elements connected to the first electrode 410 and the second electrode 430 within a specified range (for example, close to 1:1 ) have opposite polarities and in order to connect at the same time, a step of self-arranging a plurality of ultra-small light emitting diode elements by supplying AC power to the electrode lines may be performed.

A plurality of ultra-small light-emitting diode elements 313 and 315 included in the ultra-small light-emitting diode module of the present invention supply AC power to the first electrode 410 and the second electrode 430, so that the light is supplied to the first electrode 410 and the second electrode 430. The plurality of ultra-small light-emitting diode elements 313 and 315 arranged by themselves according to the change of polarity rotate, and as shown in part (i) of FIG. 4 , can be connected to the first electrode 410 and the second electrode 430 at the same time.

In the case of a general light emitting diode element, it is possible to directly and simultaneously connect to mutually different electrodes which are physically arranged and separated. For example, the light-emitting diode elements 313 and 315 can be arranged manually between different electrodes of the planar electrodes so that they lie sideways.

However, like the present invention, it is difficult to directly and physically arrange ultra-small LED elements, so there may be a problem that different ultra-small electrodes separated from each other on the same plane cannot be connected at the same time. Furthermore, the arrangement direction of at least some of the ultra-small light emitting diode elements 313 and 315 is different from each other, which increases the manufacturing cost of the light emitting diode module. And, when the ultra-small light-emitting diode elements 313, 315 are cylindrical, the ultra-small light-emitting diode elements 313, 315 cannot be arranged by themselves by simply injecting electrodes, and the cylindrical shape may cause damage from the electrodes. The problem of moving in a scrolling manner.

Therefore, the present invention can solve the above-mentioned problems by supplying an AC power to the electrode wires so that the ultra-small light-emitting diode elements are actively connected while rotating together with two different electrodes.

According to an embodiment, the AC power supply may be a variable power supply with amplitude and period, and the waveform of the AC power supply may be a pulse wave ( pulse). For example, the inverter 241 supplies an AC power that converts DC to AC, or repeatedly supplies a DC power of 0V, 30V, 0V, 30V, 0V, and 30V to the first electrode 410 1000 times per second, so as to be compatible with the first electrode 410. The first electrode 410 repeatedly supplies DC power of 0V, 0V, 30V, 0V, 30V, 0V to the second electrode 430 in the opposite manner, thus a variable power supply with amplitude and period can be prepared.

According to an embodiment, the voltage (amplitude) of the power supply may be 0.1V to 1000V, and the frequency may be 10Hz to 100GHz. A plurality of ultra-small light-emitting diode elements 313 and 315 that are self-arranged are included in a solvent 440 and put into the electrode line. The solvent 440 can be evaporated while being coated on the electrodes. The electric field formed by the potential difference is induced, so that the charge is induced in the ultra-small light-emitting diode elements 313, 315 in an asymmetrical manner, so that the two opposite ends of the ultra-small light-emitting diode elements 313, 315 are different from each other. The electrodes are self-arranged. According to an embodiment, the ultra-small LED elements 313 and 315 can be simultaneously connected to two different electrodes by supplying power within a time range of 5 seconds to 120 seconds.

On the other hand, in the step 2, the number (for example, n) of the ultra-small LED elements 313, 315 connected to the first electrode 410 and the second electrode 430 at the same time can be based on the Multiple variables to adjust to determine. Among them, it can be known that the variable can be the voltage V (or potential difference) of the supplied power supply, the frequency F (Hz) of the power supply, the concentration C of the solution containing the ultra-small light-emitting diode element (the weight percentage of the ultra-small light-emitting diode), two The distance Z between the electrodes, and the aspect ratio AR of the ultra-small LED (wherein, AR=H/D, and D is the diameter of the ultra-small LED). Thus, the number N of ultra-small LED elements 313, 315 connected to the first electrode 410 and the second electrode 430 at the same time can be related to the voltage V, the frequency F, the concentration C of the solution containing the ultra-small LED elements, and the ultra-small LED elements. The aspect ratio AR of the LED is directly proportional to the distance Z between the two electrodes.

According to one embodiment, a plurality of ultra-small light-emitting diode elements are self-arranged between two different electrodes according to the induction of the electric field formed by the potential difference between the two electrodes. The number of ultra-small light-emitting diode elements connected to the electrodes increases, and the strength of the electric field can be directly proportional to the potential difference between the two electrodes, and can be inversely proportional to the distance Z between the two electrodes.

According to an embodiment, the more the concentration C (the weight percentage of the ultra-small LEDs) of the solution containing the ultra-small LEDs is increased, the more the number of LEDs connected to the electrodes can be increased.

According to one embodiment, for the frequency F (Hz) of the power supply, since the charge difference formed in the ultra-small light-emitting diode elements 313, 315 changes based on the frequency, if the frequency increases, it is possible to connect the two electrodes. The number (for example, N) of ultra-small LED elements 313, 315 increases. Wherein, if the frequency exceeds a certain value, the charge induction can be reduced and/or eliminated, thereby reducing the number (for example, N) of ultra-small LED elements 313 and 315 connected to the electrodes.

According to one embodiment, as the aspect ratio of the small light emitting diode elements, when the aspect ratio becomes larger, the induced charge generated by the electric field can be increased, and based on this, a larger number of ultra-small light emitting diode elements 313, 315 can be made get lined up. And, when considering the electrode lines whose area is limited from the side of the space where the ultra-small light-emitting diode elements 313, 315 can be arranged, in the state where the length of the ultra-small light-emitting diode elements 313, 315 is fixed, due to the ultra-small light-emitting diode When the diameter of the element is reduced to increase the aspect ratio, the number of ultra-small light emitting diode elements that can be connected to electrode lines can be increased.

According to various embodiments of the present invention, there is an advantage that the number of light emitting diode elements connected to electrodes can be adjusted according to purposes by adjusting the various elements.

On the other hand, in Step 2 of the present invention, even if power is supplied to the electrode lines according to the aspect ratio of the ultra-small LED elements 313 and 315, it may be difficult to arrange the ultra-small LED elements by themselves. According to an embodiment, the aspect ratio of the ultra-small LED elements 313 and 315 may be 1.2-100, preferably 1.2-50, more preferably 1.5-20, most preferably 1.5-10 . When the aspect ratio of the ultra-small LED elements 313 and 315 is less than 1.2, there is a problem that the ultra-small LED elements 313 and 315 cannot be aligned by themselves when power is supplied to the electrode lines. Moreover, when the aspect ratio is greater than 100, the voltage of the power supply necessary for self-alignment may be reduced, but in the case of manufacturing ultra-small light-emitting diode elements by methods such as dry etching, it may be difficult to manufacture due to process limitations. Problem with elements larger than aspect ratio 100.

Preferably, in the step 2, the number of ultra-small light-emitting diode elements 313, 315 that can actually be installed on the electrode lines 406, 407 of the ultra-small light-emitting diode elements 313, 315 per area of 100×100 μm can be ² to 100000, more preferably 10 to 10000. By including a plurality of ultra-small LED elements 313 and 315 in each ultra-small LED module 300 , it is possible to minimize function degradation or loss due to failure of some of the plurality of ultra-small LED elements. Also, in the case of including more than 100,000 ultra-small light emitting diode elements 313, 315, the manufacturing cost may increase, and problems may occur in arranging the ultra small light emitting diode elements.

On the other hand, the manufacturing method of the ultra-small light-emitting diode module 300 according to an embodiment of the present invention is step 3 after the step 2, and the step 3 may also include connecting the first electrode 410 and the second electrode 430 with the ultra-small light emitting diode. A step of forming a metal ohmic layer at the connecting portion of the diode elements 313, 315.

The reason why the metal ohmic layer is formed at the connection portion is to make the ultra-small light-emitting diode elements emit light when power is supplied to two different electrodes connected to the plurality of ultra-small light-emitting diode elements 313 and 315 . At this time, a large resistance may be generated between the electrodes and the ultra-small LED elements 313, 315, so in order to reduce this resistance, a step of forming a metal ohmic layer may be included.

According to an embodiment, the metal ohmic layer can be formed by the following steps, but not only by the following steps, as long as it is a common method for forming the metal ohmic layer, it can be used without limitation.

First, a photoresist may be coated with a thickness of 2 μm to 3 μm on the upper portion of the ultra-small light emitting diode module 300 after the step 2 . Preferably, the coating can use one of spin coating, spray coating and screen printing, but not limited thereto. Afterwards, on the lower part of the bottom substrate 400 of the ultra-small light emitting diode module 300, ultraviolet rays are irradiated in the direction of the applied photoresist layer to irradiate the light of the remaining part except the photoresist layer on the upper part of the electrode. The photoresist layer is cured, and then the photoresist layer on the electrode that is not cured can be removed by using a common photoresist solvent.

According to an embodiment of removing the photoresist on the electrode top, it can be done by vacuum evaporation or electrochemical evaporation of gold or silver and/or by electrospraying gold nanocrystals or silver nanocrystals (electric spay). Coating is carried out, but the vapor deposition substance and vapor deposition method are not limited to the above description. Preferably, the coated metal layer may have a thickness of 5 nm to 100 nm, but not limited thereto.

Afterwards, the metal layer that is not the electrode part can be removed together with the photoresist by utilizing a photoresist remover in acetone, N-methylpyrrolidone, and dimethyl sulfoxide, and after the removal, the Metal ohmic layers are formed between the ends of both sides of the insulating film not coated with the ultra-small LED elements 313, 315 and the electrodes by heat treatment at a temperature of 500 to 600 degrees.

FIG. 5 shows a structure in which light-emitting diode modules are arranged in pixels in a display device according to an embodiment of the present invention.

According to an embodiment, the pixels 101 , 103 , 111 and/or 113 disposed on the display device 150 shown in FIG. 1 may include at least one LED module 300 . Wherein, the LED module 300 may include a first electrode 301 and a second electrode 303, and at least one electrode may be connected to at least one of the first signal line 231, the second signal line 233 and the ground 501 included in the display device 150. . For example, the first electrode 301 of the LED module 300 can be connected to at least one signal line of the first signal line 231 and the second signal line 233 included in the display device 150, and the second electrode 303 can be connected to at least one signal line included in the display device 150. The ground 501 of 150 is connected. Wherein, in the case of the ground connected to the second electrode 303 of the light-emitting diode module 300, it may be composed of a common electrode, and the common electrode is used to connect two or more grounds of the light-emitting diode module included in a plurality of pixels. into one.

According to an embodiment, in case the display device 150 included in the electronic device 100 is constituted by a touch screen, the ground of the touch screen may be formed in one layer of the display device 150 . In this case, the ground of the touch panel is formed as a transparent electrode in one layer of the display device 150 by using the transparent conductive film 503 made of indium tin oxide. Wherein, the second electrode 303 of the light-emitting diode module 300 is formed with a transparent conductive film 503. The common electrode of a layer of the display device 150 may be the same as the transparent conductive film 320 connected to at least one electrode in the light-emitting diode module 300 of FIG. 3 or similar. According to an embodiment, one layer of the display device 150 may represent one layer among a plurality of layers formed on one side of the display device 150 .

According to an embodiment of the present invention, a display device including an ultra-small light-emitting diode module includes: a panel configured with a first signal line and a second signal line in a lattice form; a first electrode, and the first signal line and the second signal line two or more switches, used to connect the first signal line and the second signal line to the first electrode; the second electrode is grounded; and the electrode assembly is composed of the first electrode and the second electrode Composed of two electrodes, the first electrode and the second electrode include a light-emitting diode module connected to a plurality of ultra-small light-emitting diode elements, the second electrode is connected to a common electrode formed by a layer of the panel, and at least one of the common electrodes is grounded For different light emitting diode modules, the more than two switches can selectively provide the first electrode with the signal provided by the first signal line based on the signal of the first signal line and the signal of the second signal line. supplied current.

According to various embodiments, the plurality of ultra-small light emitting diode elements included in the light emitting diode module may be connected along at least a part of the direction whose polarity is opposite to that of the first electrode and the second electrode.

According to various embodiments, in the light-emitting diode module, a solution containing a plurality of ultra-small light-emitting diode elements is put into the electrode assembly, and the plurality of ultra-small light-emitting diode elements are simultaneously connected to the first electrode and the second electrode by supplying AC power to the electrode assembly. The two electrodes are connected to form a plurality of sub-pixels.

According to various embodiments, in a sub-pixel, the number of ultra-small light emitting diode elements included in an area of 100×100 μm ² may be 2 to 100,000.

According to various embodiments, the plurality of ultra-small LED elements may include at least one of the plurality of ultra-small LED elements for emitting light in blue, green, red, and amber wavelength ranges.

According to various embodiments, the length of the ultra-small light emitting diode element is 100 nm to 10 μm, and the insulating film may be formed by including the active layer in the peripheral surface of the ultra-small light emitting diode element.

According to various embodiments, a plurality of ultra-small light emitting diode elements connected to the first electrode and the second electrode may be arranged in parallel with the substrate of the light emitting diode module.

According to various embodiments, the common electrode is composed of an indium tin oxide film.

According to various embodiments, the display device including the ultra-small light emitting diode module further includes an inverter for supplying the first signal line by converting direct current into alternating current, the display device including the ultra small light emitting diode module An alternating current may be selectively supplied to the first electrode based on a signal of the first signal line and a signal of the second signal line.

According to various embodiments, the first signal line connected to the light emitting diode module may be composed of more than two lines.

Above, the present invention has been described centering on examples, but this is only for illustration, and is not intended to limit the embodiments of the present invention. As long as it is known to those of ordinary skill in the technical field to which the present invention belongs, it can be understood without departing from the present invention. Various modifications and applications not illustrated above can be made within the scope of the essential characteristics. For example, each structural element specifically shown in the embodiment of the present invention can be implemented through modification. Also, the points of difference related to such modifications and applications should be construed as being included in the scope of the present invention defined in the appended scope of claims.

Claims (14)

1. A display device comprising an ultra-small light-emitting diode module, characterized in that it comprises: The panel is configured with a first signal line and a second signal line in a lattice form; The light emitting diode module includes an electrode assembly and a plurality of ultra-small light emitting diode elements, the electrode assembly has a first electrode connected to the first signal line and the second signal line and a second electrode connected to the ground, the A plurality of ultra-small light-emitting diode elements are connected to the first electrode and the second electrode; and more than two switches are used to connect the first signal line and the second signal line to the first The electrodes are connected, the second electrode is connected to the common electrode formed on the panel, and there is at least one different light-emitting diode module on the ground of the common electrode, and the two or more switches are based on the first signal line signal and the signal of the second signal line to selectively supply the current supplied by the first signal line to the first electrode. 2. The display device comprising an ultra-small light-emitting diode module according to claim 1, wherein the plurality of ultra-small light-emitting diode elements included in the light-emitting diode module are aligned with the first polarity along at least a part of the polarity. The first electrode and the second electrode are connected in opposite directions. 3. The display device comprising an ultra-small light emitting diode module according to claim 1, wherein in the light emitting diode module, a solution containing the plurality of ultra small light emitting diode elements is thrown into the electrode assembly, By supplying AC power to the electrode assembly, the plurality of ultra-small LED elements are simultaneously connected to the first electrode and the second electrode, thereby forming a plurality of sub-pixels. 4. The display device comprising an ultra-small light-emitting diode module according to claim 3, wherein in the sub-pixel, the number of the plurality of ultra-small light ^- emitting diode elements contained in an area of 100×100 μm From 2 to 100,000 pieces. 5. The display device comprising an ultra-small light-emitting diode module according to claim 1, wherein the plurality of ultra-small light-emitting diode elements include light emitting diodes in blue, green, red, and amber wavelength ranges. At least one of the plurality of ultra-small light emitting diode elements. 6. The display device comprising an ultra-small LED module according to claim 1, wherein the plurality of ultra-small LED elements comprises at least one of a plurality of LED color conversion elements formed with a color conversion layer , the color conversion layer uses light in the blue wavelength range to emit light of partial wavelengths in green, red, and amber. 7. The display device comprising an ultra-small LED module according to claim 1, wherein the plurality of ultra-small LED elements comprises at least one of a plurality of LED color conversion elements formed with a color conversion layer , the color conversion layer uses light in the ultraviolet and near-ultraviolet wavelength ranges to emit light of partial wavelengths in blue, green, red, and amber. 8. The display device comprising an ultra-small light-emitting diode module according to claim 1, wherein the length of the ultra-small light-emitting diode element is 100 nm to 10 μm, and the outer peripheral surface of the ultra-small light-emitting diode element includes active layer to form an insulating film. 9. The display device comprising an ultra-small light-emitting diode module according to claim 1, wherein the plurality of ultra-small light-emitting diode elements connected to the first electrode and the second electrode are connected to the The substrates of the LED modules are arranged in parallel. 10 . The display device comprising an ultra-small LED module according to claim 1 , wherein the common electrode is made of an indium tin oxide film. 11 . 11. The display device comprising an ultra-small LED module according to claim 1, wherein the common electrode is made of a graphene film. 12. The display device comprising an ultra-small light-emitting diode module according to claim 1, wherein the common electrode is made of a metal nanowire film. 13. The display device comprising an ultra-small light-emitting diode module according to claim 1, further comprising an inverter for supplying the first signal line by converting direct current into alternating current, said ultra-small The display device of the light emitting diode module selectively supplies an alternating current to the first electrode based on the signal of the first signal line and the signal of the second signal line. 14. The display device comprising an ultra-small light emitting diode module according to claim 1, wherein the first signal line connected to the light emitting diode module is composed of two or more lines.